Be firm in supplication, for Allah cannot be forced Al-Adab Al-Mufrad 608
Arabic hadith text
حَدَّثَنَا مُحَمَّدُ بْنُ سَلاَمٍ، قَالَ: أَخْبَرَنَا إِسْمَاعِيلُ ابْنُ عُلَيَّةَ، عَنْ عَبْدِ الْعَزِيزِ بْنِ صُهَيْبٍ، عَنْ أَنَسٍ قَالَ: قَالَ رَسُولُ اللهِ صلى الله عليه وسلم: إِذَا دَعَا أَحَدُكُمْ فَلْيَعْزِمْ فِي الدُّعَاءِ، وَلاَ يَقُلِ: اللَّهُمَّ إِنْ شِئْتَ فَأَعْطِنِي، فَإِنَّ اللَّهَ لاَ مُسْتَكْرِهَ لَهُ.
Translation
Anas reported that the Messenger of Allah, may Allah bless him and grant him peace, said, "When one of you makes a supplication, he should be firm in the supplication and not say, 'O Allah, if you like, give to me.' Allah cannot be forced against His will."